feat(server): add recipe-based model management (#2176)

examples/server/recipes/sd2-768-checkpoint.json

@@ -0,0 +1,32 @@
+{
+  "schema_version": 1,
+  "id": "sd2-768-checkpoint",
+  "name": "SD 2.1 768",
+  "slots": [
+    {
+      "id": "model",
+      "required": true
+    },
+    {
+      "id": "vae",
+      "required": false
+    },
+    {
+      "id": "tae",
+      "required": false
+    }
+  ],
+  "defaults": {
+    "cfg_scale": 7.5,
+    "steps": 20,
+    "width": 768,
+    "height": 768
+  },
+  "features": [
+    "cache_unet",
+    "clip_skip"
+  ],
+  "disabled_features": [
+    "cache_dit"
+  ]
+}